<div class="refentry" lang="en" xml:lang="en"><a id="glClientActiveTexture"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>glClientActiveTexture — select active texture unit</p></div><div class="refsynopsisdiv"><h2>C Specification</h2><div class="funcsynopsis"><table><tr><td><code class="funcdef">void <b class="fsfunc">glClientActiveTexture</b>(</code></td><td>GLenum  </td><td><var class="pdparam">texture</var><code>)</code>;</td></tr></table></div></div><div class="refsect1" lang="en" xml:lang="en"><a id="parameters"></a><h2>Parameters</h2><div class="variablelist"><dl><dt><span class="term"><em class="parameter"><code>texture</code></em></span></dt><dd><p>
                    Specifies which texture unit to make active. The number
                    of texture units is implementation dependent, but must be at least
                    two. <em class="parameter"><code>texture</code></em> must be one of
                    <code class="constant">GL_TEXTURE</code><math overflow="scroll"><mi mathvariant="italic">i</mi></math>,
                    where i ranges from 0 to the value of <code class="constant">GL_MAX_TEXTURE_COORDS</code> - 1, which is an
                    implementation-dependent value.  The initial value is
                    <code class="constant">GL_TEXTURE0</code>.
                </p></dd></dl></div></div><div class="refsect1" lang="en" xml:lang="en"><a id="description"></a><h2>Description</h2><p>
            <code class="function">glClientActiveTexture</code> selects the vertex array client state parameters to be modified by
            <a class="citerefentry" href="glTexCoordPointer"><span class="citerefentry"><span class="refentrytitle">glTexCoordPointer</span></span></a>, and enabled or disabled with
            <a class="citerefentry" href="glEnableClientState"><span class="citerefentry"><span class="refentrytitle">glEnableClientState</span></span></a> or <a class="citerefentry" href="glDisableClientState"><span class="citerefentry"><span class="refentrytitle">glDisableClientState</span></span></a>, respectively,
            when called with a parameter of <code class="constant">GL_TEXTURE_COORD_ARRAY</code>.
        </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="notes"></a><h2>Notes</h2><p>
            <code class="function">glClientActiveTexture</code> is supported only if the GL version is 1.3 or greater, or
            <code class="code">ARB_multitexture</code> is included in the string returned by
            <a class="citerefentry" href="glGetString"><span class="citerefentry"><span class="refentrytitle">glGetString</span></span></a> when called with the argument <code class="constant">GL_EXTENSIONS</code>.
        </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="errors"></a><h2>Errors</h2><p>
            <code class="constant">GL_INVALID_ENUM</code> is generated if <em class="parameter"><code>texture</code></em> is not one of
            <code class="constant">GL_TEXTURE</code><math overflow="scroll"><mi mathvariant="italic">i</mi></math>,
            where
            i ranges from 0 to the value of <code class="constant">GL_MAX_TEXTURE_COORDS</code> - 1.
        </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="associatedgets"></a><h2>Associated Gets</h2><p>
            <a class="citerefentry" href="glGet"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a> with argument <code class="constant">GL_CLIENT_ACTIVE_TEXTURE</code> or <code class="constant">GL_MAX_TEXTURE_COORDS</code>
        </p></div>
        {$pipelinestall}{$examples}
        <div class="refsect1" lang="en" xml:lang="en"><a id="seealso"></a><h2>See Also</h2><p>
            <a class="citerefentry" href="glActiveTexture"><span class="citerefentry"><span class="refentrytitle">glActiveTexture</span></span></a>,
            <a class="citerefentry" href="glDisableClientState"><span class="citerefentry"><span class="refentrytitle">glDisableClientState</span></span></a>,
            <a class="citerefentry" href="glEnableClientState"><span class="citerefentry"><span class="refentrytitle">glEnableClientState</span></span></a>,
            <a class="citerefentry" href="glMultiTexCoord"><span class="citerefentry"><span class="refentrytitle">glMultiTexCoord</span></span></a>,
            <a class="citerefentry" href="glTexCoordPointer"><span class="citerefentry"><span class="refentrytitle">glTexCoordPointer</span></span></a>
        </p></div><div class="refsect1" lang="en" xml:lang="en"><div id="Copyright"><h2>Copyright</h2><p>
            Copyright © 1991-2006
            Silicon Graphics, Inc. This document is licensed under the SGI
            Free Software B License. For details, see
            <a class="ulink" href="https://web.archive.org/web/20171022161616/http://oss.sgi.com/projects/FreeB/" target="_top">https://web.archive.org/web/20171022161616/http://oss.sgi.com/projects/FreeB/</a>.
        </p></div></div></div>
